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Groups > linux.kernel > #1185790 > unrolled thread
| Started by | Brian Gerst <brgerst@gmail.com> |
|---|---|
| First post | 2015-07-16 13:50 +0200 |
| Last post | 2015-07-16 18:00 +0200 |
| Articles | 2 — 2 participants |
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[PATCH 2/7] x86/vm86: Preserve orig_ax Brian Gerst <brgerst@gmail.com> - 2015-07-16 13:50 +0200
Re: [PATCH 2/7] x86/vm86: Preserve orig_ax Andy Lutomirski <luto@amacapital.net> - 2015-07-16 18:00 +0200
| From | Brian Gerst <brgerst@gmail.com> |
|---|---|
| Date | 2015-07-16 13:50 +0200 |
| Subject | [PATCH 2/7] x86/vm86: Preserve orig_ax |
| Message-ID | <pMPPR-5zU-31@gated-at.bofh.it> |
There is no legitimate reason for usermode to modify the orig_ax field on
entry to vm86 mode, so copy it from the 32-bit regs.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
---
arch/x86/kernel/vm86_32.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 75eab83..8424290 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -294,6 +294,8 @@ static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk
info->regs.pt.flags |= info->regs32->flags & ~SAFE_MASK;
info->regs.pt.flags |= X86_VM_MASK;
+ info->regs.pt.orig_ax = info->regs32->orig_ax;
+
switch (info->cpu_type) {
case CPU_286:
tsk->thread.v86mask = 0;
--
2.4.3
--
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| From | Andy Lutomirski <luto@amacapital.net> |
|---|---|
| Date | 2015-07-16 18:00 +0200 |
| Message-ID | <pMTJN-2N2-21@gated-at.bofh.it> |
| In reply to | #1185790 |
On Thu, Jul 16, 2015 at 4:46 AM, Brian Gerst <brgerst@gmail.com> wrote: > There is no legitimate reason for usermode to modify the orig_ax field on > entry to vm86 mode, so copy it from the 32-bit regs. Looks good. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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